Sawmill-dog



' 0. HSPITIKIN.

SAWMILLIDOG.

No. 474,687. Patented May 10, 1892.

INVENTOR WITNESSES:

'BY @Ze ATTORNEY.

UNITED STATES PATENT OFFICE.

CLARENCE H. PITKIN, OF BERLIN, VERMONT.

SAWMlLL- -DOG.

SPECIFICATION forming part of Letters Patent No. 474,687, dated May 10,1892. Application filed June 30,1891- Serial No. 398,053- (No model.)

To aZZ whom it may concern:

Be it known that I, CLARENCE H. PITKIN, a citizen of the United States,residing at Berlin, in the county of WVashington and State of Vermont,have invented certain new and useful Improvements in Sawmill-Dogs; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My present invention has reference to an improved sawmill-dog or doggingdevice for sawmill set-work, the object thereof being to simplify andperfect the construction of devices of this kind; and it thereforeconsists, essentially, in the construction, arrangement, and combinationof the several parts, substantially as will be hereinafter more fullydescribed and claimed.

In the annexed drawings, illustrating my invention, Figure 1 is a sideelevation of my improved sawmill-dog. Fig. 2 is a front elevation of thesame.

Similar letters of reference designate corresponding parts in bothfigures.

B designates a slotted knee or upright, which is placed in suitableguides on the setbeam B or some other convenient support and is adaptedand intended to have arranged therewith a suitable outsetting device formoving the dog forward and back, accordingly as the crook or taper ofthe log or cant may require, said outsetting or tapering device notbeing illustrated in the drawings, as it is unnecessary, being a featurecommon to many forms of sawmill-dogs now in use and upon which I make nospecial claim. The knee or upright 13 is constructed so as to providetwo sides, between which is a central upright recess, wherein andbetween the two sides aforesaid are an oscillating plate A, a lever H,depending rods D and E, which are pivoted at their upper ends to theoscillating plate A, and dog-slides F and G, carried on the lower endsof the rods D and E, respectively. The

sides of the recessed upright B are provided. with vertical slots 0,which receive the horizontal pivot L of the oscillatory plate A, andthus permit said plate A to have as much vertical play or oscillation asmay be necessary; and. th ese vertical slots 0 also afford beari n gswithin which the journal-pin can turn to permitplate A to rock back andforth in its partial rotative movement. The lever H is preferably curvedor bent. It is pivoted at its lower end upon the'pivot-pin L of theplate A, and it is provided at its upper end with a weighty knob or ballI, by means of which additional force may be given to the blow of thelever, and by means of which, also, it may be held in place when thrownto one side or the other to move the rocking plate, said lever H beingguided in its back-and-forth movement by the sides of the upright withinwhich it is inclosed and embraced,as shown. The plateAis provided on oneside with a recess, within which lies the lower portion of the lever H,and at the edges of this recess are shoulders J and K, againstwhich thelever strikes as it moves from one position to the other. The lowerportion of the dog-frame B is provided with vertical slots, within whichthe dog-slides F and G work, and said slides are of course provided withthe dogs in the usual way.

The operation and use of my improved sawmill-dog as thus described willbe readily apparent from the foregoing without need of additionaldescription.

An important feature of the invention is the movable pivot of theoscillating plate, whereby said plate is enabled to travel up and downvertically and thus adjust itself so that the best results in the way ofdogging may be accomplished.

By referring to Fig. 2 it will be seen that the weight of the plate A,lever H, rod 18, and upper dog F is supported upon the lower dog G bymeans of the rod E, which, being pivoted to the plate A, holds thelatter in the position in which it is seen. Now if the operator throwsthe lever 1-1 over toward the right, it will strike the opposite edge ofthe recess in the plate A or will strike shoulder J on said plate,thereby causing the plate to partially revolve, and also carrying thetop of the rod E toward the left, thereby removing the support frombeneath the plate A, which consequentlv fallsin the slot C until theupper dog F strikes the log or cant which is to be dogged. When theupperdog F strikes the cant, it becomes the fulcrum upon which the lowerdog G will be raised, the pivot rising in the slot until the lower dogstrikes the log or cant, and then by the force of the lever both dogsare driven into the Wood. It will thus be readily understood that bymeans of the vertically-adjustable plate having the movable pivot thedogs or teeth are adjusted and forced into the Wood by a single blow ofthe lever instead of by several motions thereof, as is required withmany other forms of dogging devices. Thus I achieve simplicity ofconstruction and ease of operation by means of my improvement.

Numerous changes in the exact and precise construction and arrangementof the parts and in their relative connections may doubtless be made inorder to adapt the dogging device for use in different places, and Ireserve the liberty of making all such changes as may be necessary toadapt the invention for the best possible practical application thereofwithout departing from the general scope and plan thereof as hereinexplained.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a sawmill dog, the combination of a knee or upright,vertically-movable slides therein provided with dogging-teeth projectingin opposite directions, an oscillatory and vertically-movable platepivoted in vertical slots in the upright, a weighted lever supported onthe pivot-pin of said plate, which plate is provided with suitableshoulders to receive the blows of said weighted lever, together with therods connecting the doggingslides to the plate, substantially asdescribed. 2. In a sawmill-dog, the combination of the upright or mainsupport provided with vertical slots, an oscillatory andvertically-movable plate whose pivot or journal operates within saidslots, a lever pivoted on the journal of said plate, and thedogging-slides connected to the plate, substantially as described. Thecombination of the main support B, having vertical slot 0, theoscillating and vertically-movable plate A, having pivot-pin L, thelever H, pivoted on said pin L, the shoulders J and K on the plate A,the dogging-slides F and G, and the connecting-rods D and E, pivoted tothe plate A and carrying said slides, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CLARENCE H. PI'IKIN.

Witnesses:

CARROL P. PITKIN, FRANK I. PITKIN.

